8/10/2017 7:42 AM PDT

Sinead O'Connor is getting support from a huge star -- British boxing champ Tyson Fury -- who says he also suffers from mental illness and wants to help the singer through the darkness.

"I recently watched one of your heartbreaking videos where you talked about mental health problems," the former heavyweight champ said.

"Being alone, and feeling like you wasn’t a role model – and it wasn’t your fault – and no one was there."

Sinead posted a video last week saying she's suicidal and living in a motel in New Jersey.

Fury, who stepped away from boxing last year to get help for substance abuse issues, says he's also been suffering from mental illness and wants Sinead to know "you're not alone."

"There’s a lot of people out there who go through this same thing ... millions of people around the world suffer with this."

"Mental health problems is one of the worst things that anyone could ever have, no matter how successful or rich you become. Mental health will always bring you down. And it always gives someone a right to write you off, for whatever reason."

"But I’m here if you need me. Tyson Fury – get someone to contact me. I’d like to speak to you."

8/4/2017 7:38 AM PDT

Amir Khan just went nuclear on his wife, accusing her of banging heavyweight champ Anthony Joshua ... after telling the world he's divorcing her.

Khan has been married to model Faryal Makhdoom since 2013, but took to Twitter minutes ago to announce the marriage is OVER.

"So me and the wife Faryal have agreed to split. I'm currently in Dubai. Wish her all the best."

He didn't leave it there, telling the whole world he thinks Faryal is rebounding with Joshua.

"Faryal moved on quick. Always mentioned to me how much she wanted to be with another guy, from all people another boxer @anthonyfjoshua"

Faryal isn't taking the whole thing lying down (lol), and fired off a series of Tweets of her own saying Khan is just a washed up crybaby looking for attention, and the real cheater in the relationship.

"Accusing other boxers just because your boxing career is finished. Man up amir."

"I'm not the one who's been in the papers every month with my pants down 😂 Cheater!"

So far no response from Joshua, but his text messages have to be crazy right now.

8/3/2017 12:45 AM PDT

EXCLUSIVE

Conor McGregor put in some violent work Tuesday night -- going "12 hard rounds" with boxing champ Paulie Malignaggi ... and left some marks in the process.

The two got in the ring in Vegas for a full speed workout session to prep for the August 26 superfight with Floyd Mayweather -- and the former WBA welterweight champ tells TMZ Sports, "We both gave each other really good work."

Malignaggi says McGregor been making steady improvements in the ring since the last time they fought 12 days before ... and says he's landing real shots. You can tell by Paulie's face.

As for Conor's power, Paulie says it's time for a reality check.

"Conor doesn't have bad power. It's not 'Oh my god' power ... but it is respectable power."

"Every time I say this people get offended. It's like they want you to lie. It's like they want you to say he has this incredible power like I've never felt anything like it before."

"It is power to where if it hits you, it's gonna get your attention and it may even put you down if you're wearing those smaller fight gloves."

As for Conor's confidence, Paulie says the Irish superstar "really believes in his mind he's gonna win the fight."